L-GAGE LT3 Long-Range Time-of-Flight Laser Sensor

Transcription

1 L-GAGE LT3 Long-Range Time-of-Flight Laser Sensor Self-contained Class 2 laser distance sensor, analog and discrete outputs Features Extremely long range: 5 m with white targets, or 3 m with gray targets Banner s unique scalable analog output automatically distributes the output signal over the width of the programmed sensing window Analog and iscrete (switched) outputs in each sensor, with independent window limits iscrete output can be used for precision background suppression Choose NPN or PNP discrete output, plus 0 to 10V dc or 4 to 20 ma sourcing analog output Fast, easy-to-use integrated push-button TEACH-mode programming; no potentiometer adjustments Remote TEACH function for security and convenience Output response is programmable for three speeds Choose 2 m or 9 m unterminated cable, or 8-pin Euro-style swivel Q connector Rugged construction withstands demanding sensing environments; rated IEC IP67, NEMA 6! WARNING... Not To Be Used for Personnel Protection Never use these products as sensing devices for personnel protection. oing so could lead to serious injury or death. These sensors do NOT include the self-checking redundant circuitry necessary to allow their use in personnel safety applications. A sensor failure or malfunction can cause either an energized or de-energized sensor output condition. Consult your current Banner Safety Products catalog for safety products which meet OSHA, ANSI and IEC standards for personnel protection.! CAUTION... This sensor contains no userserviceable components. o not attempt to repair. Incorrect component values may produce hazardous laser radiation levels. Models LT3PU LT3PUQ LT3NU LT3NUQ LT3PI LT3PIQ LT3NI LT3NIQ Sensing istance 300 mm to 5 m (11.8" to 16.4') 90% reflectivity white card (see specifications for more information.) Models Cable* 2 m (6.5') 8-wire 8-pin Euro-style Q 2 m (6.5') 8-wire 8-pin Euro-style Q 2 m (6.5') 8-wire 8-pin Euro-style Q 2 m (6.5') 8-wire 8-pin Euro-style Q Supply Voltage 12 to 24V dc iscrete Output PNP (Sourcing) NPN (Sinking) PNP (Sourcing) NPN (Sinking) * 9 m cables are available by adding suffix W/30 to the model number of any cabled sensor (e.g., LT3PU W/30). A model with a Q connector requires a mating cable; see page 10. NOTE: See Banner website for information on diffuse and dual-discrete models at: IFFUSE LASER Analog Output Analog Voltage (0 to 10V dc) Analog Current (4 to 20 ma) Printed in USA 02/05 P/N rev.

2 Theory of Operation A short electrical pulse drives a semiconductor laser diode to emit a pulse of light. The emitted light is collimated through a lens, which produces a very narrow laser beam. The laser beam bounces off the target, scattering some of its light through the sensor s receiving lens to a photodiode, which creates an electrical pulse. The time interval between the two electrical pulses (transmitting and receiving the beam) is used to calculate the distance to the target, using the speed of light as a constant. Multiple pulses are evaluated by the sensor s microprocessor, which calculates the appropriate output value. The analog output provides a variable signal (4 to 20 ma or 0 to 10V dc, depending on model) that is proportional to the target s position within the user-programmed analog window limits. The discrete (switched) output energizes whenever the target is located between the user-programmed discrete window limits. Window limits for the analog and discrete outputs may be the same, or they may be programmed independently. User Interface Microprocessor Time-of-Flight Engine Emitter Circuitry Analog Signal Processing Laser Emitter E R Receiver Element Lenses Target Output Circuitry Figure 1. Theory of operation Programming The L-GAGE LT3 laser sensor has three selectable response speeds and can be programmed in several ways for specific window limits. Response Speed Prior to setting window limits, use the sensor s Speed push button to toggle between the three response speed settings. The selected speed will be indicated by one of the three Response Speed indicator LEs (see Figure 2). See page 5 for further information. Sensor Power Up/Laser Enable Allow 30 minutes after power-up to allow the sensor s internal temperature to stabilize, before operating or attempting to program the sensor. If the sensor will be used in applications where the temperature is several degrees higher or lower than ambient, allow the sensor to stabilize in that condition before programming the window limits. (Range will decrease as the sensor warms up.) The laser enable feature allows the sensor to be continually powered, and enabled only when being used. This eliminates the need for the extended warm-up period between uses. See page 6 for indicator status. Signal LE Response Speed Indicators Analog LE Analog Output Programming Push Button SIGNAL FAST ME SLOW A TEACH OUTPUT SPEE POWER Power ON/OFF LE Output LE Response Speed Push Button iscrete LE iscrete (switched) Output Programming Push Button Figure 2. LT3 Time-of-Flight Sensor features The sensor s red Signal LE indicates the condition of the received signal from the object being measured. When programming window limits, this LE must be ON solid (not flashing) for the sensor to accept the setting. To ensure that the received signal will not be marginal during operation, move the target object 300 mm beyond the furthest desired setpoint during setup, and verify that the signal LE is still ON solid. 2 P/N rev.

3 Class 2 Safety Notes Low-power lasers are by definition incapable of causing eye injury within the duration of the blink, or aversion response, of 0.25 seconds. They must also emit only visible wavelengths ( nm). Therefore, an eye hazard can exist only if an individual overcomes the natural aversion to bright light and stares directly into the laser beam. These lasers are required to have a hazard label and to have an indicator light to indicate that laser emission is occurring. When operating a class 2 laser: o not permit a person to stare directly into the beam o not point the laser at a person s eye at close range Beam Paths: The beam emitted by a class 2 laser product should be terminated at the end of its useful path. Open laser beam paths should be located above or below eye level, where practical. LASER LIGHT O NOT STARE INTO BEAM CLASS 2 LASER PROUCT Avoid exposure - laser light emitted from this aperture RAIANT POWER 0.5 mw nm COMPLIES WITH 21 CFR PART AN EN :1994 Window Limits Window limits may be taught to the sensor in several ways, either using the push buttons on the top of the sensor or via a remote switch. Remote Programming To program the sensor remotely or to disable the keypad, the Remote Programming function may be used. isabling the keypad prevents accidental or unauthorized adjustment of the programming settings. Connect the yellow wire of the sensor to +5 to 24V dc, with a remote programming switch connected between them. NOTE: The impedance of the remote teach input is 55 kω. Programming is accomplished by following a sequence of input pulses (see pages 4 and 5). The duration of each pulse (corresponding to a push button click ), and the period between multiple pulses, are defined as T : 0.04 seconds T 0.8 seconds. Analog Output Slope The L-GAGE LT3 Sensor may be programmed for either a positive or a negative output slope, based on which condition is taught first (see Figure 3). If the near limit is taught first, the slope will be positive; if the far limit is taught first, the slope will be negative. Banner s unique scalable analog output (patent pending) automatically distributes the output signal over the width of the programmed sensing window. In the event of analog signal loss for longer than 2 seconds, the analog output goes to 0V dc or 3.6 ma, which may be used to trigger an alarm. ing Analog Limits Using the Auto-Zero Feature (Analog Output) For some analog applications, a sensing distance set point centered within a sensing window may be required. The TEACH procedure is simple: teaching the same limit twice causes the sensor to program a 1 m window centered on the position taught (taught position ± 0.5 m). ing iscrete Limits for Background Suppresson For some applications, ignoring objects beyond a certain distance may be required. To suppress the background, place a target object at the selected distance, and teach the position twice. The sensor s discrete output will activate when an object is detected between the sensor s minimum sensing distance and the taught position. NOTE: The sensor allows for some forgiveness in this procedure. If the two limits are not exactly the same (but less than 20 mm apart), the sensor will put the set point at the average of the two limits. Current-Sourcing Models Voltage-Sourcing Models Analog Output (ma) 20 Positive Slope Analog Output (V dc) 10 Positive Slope 4 0 Near Window Far Window Near Window Far Window Target Position Target Position NOTE: The linear analog output tracks slightly past each window limit (from 3.8 to 20.5 ma) Figure 3. Analog output as a function of target position P/N rev. 3

4 Either output may be programmed first. ing Limits for Either Analog or iscrete Output Programming Mode Push Button 0.04 click 0.8 sec. Remote Wire 0.04 sec. T 0.8 sec. Procedure Result Procedure Result Push and hold push button for Analog or iscrete output > 2 seconds* or Appropriate TEACH LE turns ON Sensor is waiting for first limit No action required A First Limit Position the target for the first limit** Click the same push button TEACH LE flashes Sensor learns first limit and waits for second limit Position the target for the first limit** Analog Output ouble-pulse the remote line iscrete Output Single-pulse the remote line Appropriate TEACH LE turns ON then flashes at 2 Hz Sensor learns first limit and waits for second limit T T T T Second Limit Position the target for the second limit Click the same push button TEACH LE goes OFF Sensor learns second limit and returns automatically to RUN mode Position the target for the second limit Single-pulse the remote line T Appropriate TEACH LE goes OFF Sensor learns second limit and returns automatically to RUN mode Program Second Output Repeat for other output, if a second output is desired. * Sensor will return to RUN mode if first TEACH condition is not registered within 120 seconds. ** Press and hold the same push button (or hold the remote line high) > 2 seconds (before teaching the second limit) to exit PROGRAM mode without saving any changes. The sensor will revert to the last saved program. 4 P/N rev.

5 ing Limits for Analog and iscrete Outputs Simultaneously Both Analog and iscrete outputs will have identical limits. Programming Mode Push Button 0.04 click 0.8 sec. Remote Wire 0.04 sec. T 0.8 sec. Procedure Result Procedure Result Push and hold either push button for > 2 seconds* A or Briefly click the other button Corresponding TEACH LE turns ON Corresponding TEACH LE turns ON Sensor is waiting for first limit No action required First Limit Position the target for the first limit** Click either push button Both TEACH LEs flash at 2 Hz, alternating Red and Green Sensor learns first limit and waits for second limit Position the target for the first limit** Triple-pulse the remote line Both TEACH LEs turn ON Sensor learns first limit and waits for second limit Both TEACH LEs flash at 2 Hz, alternating Red and Green Second Limit A or T T T T T Position the target for the second limit Click either push button or Both TEACH LEs go OFF Sensor learns second limit and returns automatically to RUN mode Position the target for the second limit Single-pulse the remote line T Both TEACH LEs go OFF Sensor learns second limit and returns automatically to RUN mode A * Sensor will return to RUN mode if first TEACH condition is not registered within 120 seconds. ** Press and hold the same push button (or hold the remote line high) > 2 seconds (before teaching the second limit) to exit PROGRAM mode without saving any changes. The sensor will revert to the last saved program. Sensor Setup Response Speed Use the Speed push button to toggle between the three response speed settings. The selected speed is indicated by one of three Response Speed indicator LEs (see Figure 2). Slow Medium Fast iscrete Output Response Speed 100 ms ON and OFF 10 ms ON and OFF 1 ms ON and OFF Analog Output Frequency Response (-3dB) 4.5 Hz (100 ms average/4 ms update rate) 45 Hz (10 ms average/2 ms update rate) 450 Hz (1 ms average/1 ms update rate) P/N rev. 5

6 Push Button Lockout Enables or disables the keypad to prevent accidental or unauthorized adjustment of the programming settings. Enable/isable Push Buttons Push Button Not available via push button Procedure Remote Wire 0.04 sec. T 0.8 sec. Four-pulse the remote line T T T T T T T Result Push buttons are either enabled or disabled, depending on previous condition Indicators Power Up/Laser Enable Indicators When powering up the sensor, the following should occur: All LEs turn ON for 1 second Allow 0.6 second delay for Laser Enable at power up. If sensor is already powered up, see table at right for Laser Enable time. Laser isable time for all speeds is 50 ms. Signal LE (red) indicates the strength and condition of the sensor s incoming signal. Selected Response Speed Slow Medium Fast Laser Enable Time 150 ms 60 ms 51 ms Signal LE Status ON OFF Flashing Good signal Indicates No signal is received, or the target is beyond the range limitations of the sensor (with some tolerance beyond the recommended minimum and maximum sensing distance) Marginal signal strength (can not teach limits) Output LE (yellow) lights when a target is sensed within the programmed discrete window limits. Power ON/OFF LE (green) indicates the operating status of the sensor. Power ON/OFF LE Status OFF 2Hz 1Hz ON Solid Indicates Power is OFF iscrete output is overloaded (RUN mode) Power ON, Laser is disabled Sensor is operating normally (power ON, Laser enabled) 6 P/N rev.

7 Sensing Range 90% White card: 18% Gray card: 6% Black card: 0.3 to 5 m 0.3 to 3 m 0.3 to 2 m Supply Voltage and Current Supply Protection Circuitry elay at Power-up Sensing Beam Output Protection Output Configuration Output Rating Output Response Time 12 to 24V dc (10% maximum ripple); 108 ma 24V dc or [2600/V dc] ma Protected against reverse polarity and transient voltages 1 second; outputs do not conduct during this time 658 nm visible red IEC and CRH Class 2 laser; 0.5 mw max. radiant output power; typical beam dia: 6 mm (typical laser lifetime 75,000 hours). Protected against short circuit conditions iscrete (switched): SPST solid-state switch; choose NPN (current sinking) or PNP (current sourcing) models Analog output: 0 to 10V dc or 4 to 20 ma iscrete (switched) output: 100 ma maximum Off-state leakage current: < 5 µa Output saturation NPN: < ma and < 600 ma Output saturation PNP: < 1.2V at 10 ma; < 1.6V at 100 ma Analog voltage output: 2.5 kω minimum load impedance Analog current output: 1 kω 24V; max. load resistance = [Vcc-4.5/0.02 Ω] iscrete output Slow: 100 ms ON and OFF Medium: 10 ms ON and OFF Fast: 1 ms ON and OFF Linearity ± 30 mm from 0.3 to 1.5 m; ± 20 mm from 1.5 to 5 m. See Figure 6. dc, 22 C using a 90% reflectance white card) Resolution/Repeatability See Figure 4. Analog Voltage output (-3 db) Slow: 4.5 Hz (100 ms average/ 4 ms update rate) Medium: 45 Hz (10 ms average/ 2 ms update rate) Fast: 450 Hz (1 ms average/ 1 ms update rate) Color Sensitivity 90% white to 18% gray: <10 mm; 90% white to 6% black: < 20 mm. See Figure 5. iscrete Output Hysteresis Fast: 10 mm Medium: 5 mm Slow: 3 mm Temperature Effect < 2 mm / C Minimum Window Size Remote Input Remote TEACH Adjustments Laser Control 20 mm 18 kω minimum (65 kω at 5V dc) Specifications To teach: Connect yellow wire to +5 to 24V dc To disable: Connect yellow wire to 0 to +2V dc (or open connection) See Remote Programming on page 3. Response speed: Push button toggles between 1, 10 and 100 ms Window limits (analog or discrete): TEACH-mode programming of near and far window limits (see programming procedure). Limits may also be taught remotely via TEACH input (see page 3). Analog output slope: The first limit taught is assigned to minimum output current or voltage (4 ma or 0V dc). Push-button enable/disable (lockout): via remote line (see page 6) Factory defaults: 100 ms response speed Analog/discrete window limits 0.3 m - 5 m using a 90% reflectivity white card Positive analog slope Push buttons enabled Connect red wire to +5 to 24V dc to enable laser beam; connect to 0 to +1.8V dc (or open connection) to disable. See page 6 for delay times on enable. P/N rev. 7

8 Indicators Construction Environmental Rating IP67, NEMA 6 Connections Operating Conditions Specifications, continued Green Power ON LE: Indicates when power is ON, overloaded output and laser status Yellow Output LE: Indicates when discrete load output is conducting Red Signal LE: Indicates target is within sensing range and the condition of the received light signal 3 Yellow Speed LEs: Indicate the response speed setting Red/Green TEACH LEs: Sensor is in programming mode (red analog output; green discrete output) NOTE: See page 6 for more information on indicator behavior. Housing: ABS Window: Acrylic Quick-disconnect: ABS/polycarbonate blend 2 m (6.5') or 9 m (30') shielded 7-conductor (with drain) PVC-jacketed attached cable or 8-pin Euro-style quick-disconnect Temperature: 0 to +50 C (+32 to +122 F) Maximum Relative Humidity: 90% at 50 C (non-condensing) Application Note Allow 30-minute warm-up before programming or operating (see Sensor Power-up/Laser Enable, page 2) Certifications Resolution (mm) Resolution/Repeatability vs. istance Fast Medium Slow Color Sensitivity (mm) Typical Color Sensitivity 90% White to 18% Gray 90% White to 6% Black istance (m) 4 5 6% Black 18% Gray 90% White istance (m) 4 5 Figure 4. LT3 resolution Figure 5. LT3 color sensitivity (typical) 20 Typical Linearity with 90% Reflectance White Card Linearity Error (mm) istance (m) 4 5 Figure 6. LT3 linearity (typical) 8 P/N rev.

9 imensions Mounting Hardware: M4 x 0.7 x 40 socket-head cap screw M4 x 0.7 hex nut with captured toothed lock washer M3 short arm hex key 35.3 mm (1.38") SIGNAL OUTPUT FAST mm (4.04") 86.9 mm (3.42") SPEE ME SLOW TEACH A POWER 87.0 mm (3.43") 5.9 mm (0.23") 75.6 mm (2.98") RAIANT POWER 0.5mW 10ns PULSE, 1MHz nm COMPLIES TO 21 CFR PART AN EN :1994 Avoid exposurelaser light emitted from this aperture 40.6 mm (1.59") 19.5 mm (0.76") 48.8 mm (1.92") 1. Press and hold appropriate button untill light turns ON. 2. Ad. Press but 3. Press button. ( turns OFF..) 68.5 mm (2.70") LT3NILVQ bn + bu 12-24V dc wh 4-20mA gn gy iscrete Load rd Laser Control ye Shield L-GAGE 5.2 mm (0.20") 15.0 mm (0.59") 2x ø4.5 mm (0.18") C'sink ø7.3 mm (0.29"), 5.3 mm (0.21") deep Hookups NPN Analog Current bn + bu 12-24V dc wh + gn 4-20mA gy iscrete Load rd Laser Control ye Shield PNP Analog Current bn + bu 12-24V dc wh + gn 4-20mA gy iscrete Load rd ye Laser Control Shield NPN Analog Voltage bn + bu 12-24V dc wh + gn 0-10V gy iscrete Load rd ye Laser Control Shield PNP Analog Voltage bn + bu 12-24V dc wh + gn 0-10V gy iscrete Load rd ye Laser Control Shield NOTE: Hookups for Q models are functionally identical. P/N rev. 9

10 Accessories Euro-Style Quick-isconnect Cables Cable: PVC jacket, polyurethane connector body, chrome-plated brass coupling nut Conductors: 24 AWG high-flex stranded, PVC insulation, gold-plated contacts Temperature: -40 to +105 C (-40 to +221 F) Voltage Rating: 30V ac/36v dc Style Model Length Connector Pinout (Female View) 8-Pin Euro Straight MQC-806 MQC-815 MQC m (6.5') 5 m (15') 9 m (30') 42.0 mm (1.65") M12 X mm (0.56") Gray Yellow Green Brown Red or Pink Blue White Shield Accessory Mounting Brackets SMBLT31 Right-angle bracket 300 series stainless steel 8.0 mm (0.31") 13.0 mm (0.51") 20.5 mm (0.81") 24.1 mm (0.94") 2x R2.5 (0.10") ø5.0 mm (0.20") R89.6 mm (3.53") 2x ø4.0 mm (0.16") R47.5 mm (1.87") R172 mm (6.77") x R2.5 (0.10") 68.0 mm (2.67") ø5.0 mm (0.20") 13.0 mm (0.51") 14.0 mm (0.55") 65.0 mm (2.56") 85.5 mm (3.36") 5.0 mm (0.20") 32.0 mm (1.26") 10 P/N rev.

11 Mounting Brackets, continued SMBLT32 Heavy-duty protective bracket 304 series stainless steel Mounting hardware included 8.5 mm (0.33") 16.0 mm (0.63") C L mm (1.79") 65.0 mm (2.56") C L 4x R5.0 mm (0.20") mm (2.16") 35.0 mm (1.38") 28.0 mm (1.10") 22.0 mm (0.87") R 89.6 mm (3.52") 17.0 mm (0.67") 16x R2.5 mm (0.09") 72.0 mm (2.83") 19.0 mm (0.74") ø28.0 mm (1.10") mm (0.20") 70.0 mm (2.75") 19.2 mm (0.76") mm (0.822") 2x ø5.0 mm (0.20") 90.0 mm (3.53") 6.0 mm (0.24") R5.5 mm (0.22") 12.3 mm (0.48") SMBLT3IP Replaceable windows for welding environments Stainless steel construction Includes 2 weld-resistant windows 89.6 mm (3.53") 12.7 mm (0.50") mm (4.25") Ø 4.5 mm (0.18") 41.4 mm (1.63") 2 X 29.7 mm (1.18") mm (5.11") mm (4.50") 2 X 55.9 mm (2.20") mm (1.23") 42.9 mm (1.69") 2.7 mm (0.10") 82.5 mm (3.25") mm (0.57") 4 X R 3.3 mm (0.13") 54.1 mm (2.13") P/N rev. 11

12 WARRANTY: Banner Engineering Corp. warrants its products to be free from defects for one year. Banner Engineering Corp. will repair or replace, free of charge, any product of its manufacture found to be defective at the time it is returned to the factory during the warranty period. This warranty does not cover damage or liability for the improper application of Banner products. This warranty is in lieu of any other warranty either expressed or implied. P/N rev. Banner Engineering Corp., 9714 Tenth Ave. No., Minneapolis, MN Phone: